Code refactoring

- Code refactoring
- Fix a bug that the other player will not become the host of the room at once, when the player disconnect in link play.

> Maybe add many unknown bugs. XD
> The song database `arcsong.db` will not used in the future. You can use a tool in `tool` folder to import old data.

latest version/server/multiplayer.py

@@ -0,0 +1,81 @@
+from multiprocessing import Pipe
+
+from core.error import ArcError
+from core.linkplay import LocalMultiPlayer, Player, Room
+from core.sql import Connect
+from flask import Blueprint, request
+from setting import Config
+
+from .auth import auth_required
+from .func import error_return, success_return
+
+bp = Blueprint('multiplayer', __name__, url_prefix='/multiplayer')
+
+conn1, conn2 = Pipe()
+
+
+@bp.route('/me/room/create', methods=['POST'])  # 创建房间
+@auth_required(request)
+def room_create(user_id):
+    if not Config.UDP_PORT or Config.UDP_PORT == '':
+        return error_return(ArcError('The local udp server is down.', 151)), 404
+    with Connect() as c:
+        try:
+            x = LocalMultiPlayer(conn1)
+            user = Player(c, user_id)
+            user.get_song_unlock(request.json['clientSongMap'])
+            x.create_room(user)
+            r = x.to_dict()
+            r['endPoint'] = request.host.split(
+                ':')[0] if Config.LINK_PLAY_HOST == '' else Config.LINK_PLAY_HOST
+            r['port'] = int(Config.UDP_PORT)
+            return success_return(r)
+        except ArcError as e:
+            return error_return(e), 400
+    return error_return()
+
+
+@bp.route('/me/room/join/<room_code>', methods=['POST'])  # 加入房间
+@auth_required(request)
+def room_join(user_id, room_code):
+    if not Config.UDP_PORT or Config.UDP_PORT == '':
+        return error_return(ArcError('The local udp server is down.', 151)), 404
+
+    with Connect() as c:
+        try:
+            x = LocalMultiPlayer(conn1)
+            user = Player(c, user_id)
+            user.get_song_unlock(request.json['clientSongMap'])
+            room = Room()
+            room.room_code = room_code
+            x.join_room(room, user)
+            r = x.to_dict()
+            r['endPoint'] = request.host.split(
+                ':')[0] if Config.LINK_PLAY_HOST == '' else Config.LINK_PLAY_HOST
+            r['port'] = int(Config.UDP_PORT)
+            return success_return(r)
+        except ArcError as e:
+            return error_return(e), 400
+    return error_return()
+
+
+@bp.route('/me/update', methods=['POST'])  # 更新房间
+@auth_required(request)
+def multiplayer_update(user_id):
+    if not Config.UDP_PORT or Config.UDP_PORT == '':
+        return error_return(ArcError('The local udp server is down.', 151)), 404
+
+    with Connect() as c:
+        try:
+            x = LocalMultiPlayer(conn1)
+            user = Player(c, user_id)
+            user.token = int(request.json['token'])
+            x.update_room(user)
+            r = x.to_dict()
+            r['endPoint'] = request.host.split(
+                ':')[0] if Config.LINK_PLAY_HOST == '' else Config.LINK_PLAY_HOST
+            r['port'] = int(Config.UDP_PORT)
+            return success_return(r)
+        except ArcError as e:
+            return error_return(e), 400
+    return error_return()